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Open the hatch back. On the left-hand side is a panel that you can open in which the jack resides. Take that out.

(If you want to use the spare tire, located under the trunk space...)You will see a plastic disc on the floor of the trunk space (where you store your luggage/groceries/etc). With a flat head screw driver pop the flat disc up & off. This will reveal a nut that you can turn to lower/release the spare tire that is directly underneath it.

If your T&C is like mine, you have a plastic cover in the middle of each alloy wheel that covers the lug nuts. This plastic cover can be popped off with the flat/nubby end of the crow bar that comes with the jack. It fits perfectly into a slot on the plastic cover.

Once you get the plastic cover off, the 5 lug nuts are revealed to you. Before you jack up the van, even a little, I would try to loosen all 5 lug nuts, just a bit...to get them going. Once the van is jacked up, it will be difficult to begin to loosen the lug nuts.

With the nuts loosened, set up the jack so that once you begin to turn it, the slot in the jack fits right into the frame of the van. You will see the frame that fits the slot in the jack between the front tires and back tires, on either side of the van.

Once the tire you want to change is fully lifted off of the ground, loosen the rest of the lug nuts and remove the tire. Replace it and reverse the order of what you just did. Get the 5 lug nuts onto the new tire, but only snug them up by hand. Once the tire touches the ground as the jack is lowered, then you can fully tighten the lug nuts with the crowbar.

Are you using the rod and turning the crank to lower the spare tire? There will be a little hold along the trim of the trunk opening by the top of the bumper. You need to insert the rod into this hole and crank it to lower the tire

With the new 2008 models, the spare tire was moved from the rear of the van to a spot below the front seats. The lug for the tire winch is located under a round cover in the floor just in front of and between the two front seats. If you look under the van, you will see the black tire-shaped cover for the spare.

its located under the body of the van on the drivers side.. changing anything on it will not improve the mileage..may be time for a tune up.. induction service or air and fuel filters.. keep in mind that winter furl gives lower mileage